Adjustable trestle



FIG. 1 is a perspective view of an adjustable trestle showing my new design;

FIG. 2 is a top plan view of the adjustable trestle;

FIG. 3 is an end elevational view of the adjustable trestle, the opposite end view appearing the same; and

FIG. 4 is a side elevational view of the adjustable trestle, the opposite side view appearing the same. 

The ornamental design for an adjustable trestle, as shown and described. 